CA2849803C - Ball deflecting chamfer - Google Patents
Ball deflecting chamfer Download PDFInfo
- Publication number
- CA2849803C CA2849803C CA2849803A CA2849803A CA2849803C CA 2849803 C CA2849803 C CA 2849803C CA 2849803 A CA2849803 A CA 2849803A CA 2849803 A CA2849803 A CA 2849803A CA 2849803 C CA2849803 C CA 2849803C
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- CA
- Canada
- Prior art keywords
- hammer
- cam shaft
- tool
- ball
- anvil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000446 fuel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
- B25B21/026—Impact clutches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/10—Means for driving the impulse member comprising a cam mechanism
- B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/10—Means for driving the impulse member comprising a cam mechanism
- B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
- B25D11/104—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool with rollers or balls as cam surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
- F16H25/12—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation along the axis of rotation, e.g. gearings with helical grooves and automatic reversal or cams
- F16H25/122—Gearings with helical grooves and automatic reversal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
- B25D2211/06—Means for driving the impulse member
- B25D2211/062—Cam-actuated impulse-driving mechanisms
- B25D2211/065—Cam-actuated impulse-driving mechanisms with ball-shaped or roll-shaped followers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0003—Details of shafts of percussive tool bits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Abstract
A cam shaft is disclosed having an asymmetric chamfer for guiding a ball bearing deeper into a cam shaft groove to avoid ball loss when an immediate deceleration force is applied. The chamfer spaces the ball from an opening in the front face of a hammer that moves axially relative to the cam shaft when a tool having the cam shaft and hammer is dropped. The ball is therefore less likely to escape through the front opening of the hammer when the impact wrench is dropped.
Description
Ball Deflecting Chamfer This application claims priority based on United States Patent Application 13/894,075 entitled "BALL DEFLECTING CHAMFER" filed May 14, 2013.
Technical Field of the Invention The present application relates to ball bearing systems. More particularly, the present application relates to a ball deflecting chamfer that deflects a ball bearing into an advantageous position when a force is applied to the ball bearing, thus preventing inadvertent removal of the ball from the system.
Background of the Invention Many tools have parts that interact with each other through ball bearings. The ball is typically positioned within a groove or circular cavity and provides a rolling interface between two moving parts, reducing friction between the parts while still allowing relative movement.
For example, impact wrenches include a ball bearing interface between a cam shaft and hammer. The ball is inserted into straight or angled grooves that are defined along the exterior of the cam shaft, and interface with cooperative grooves in thc hammer. One such cam shaft is shown in Fig. 5. This cam shaft 535 includes a base 540 and a shaft 545 extending from the base 540. The shaft 545 includes grooves 550 for receiving a ball bearing that interfaces with grooves in a hammer. The cam shaft 535 also includes holes 555 to receive fasteners, such as screws or nails, for attachment to other objects.
Prior art cam shafts 535 include grooves that include a vertex 560. When the impact wrench is dropped, the cam shaft 535 abruptly stops once it impacts the ground, and the deceleration forces move the balls to the vertex 560 of the cam shaft 535. At the same time, the hammer is movably disposed on the shaft 545 and moves axially against a spring, sliding over the ball bearings and allowing the ball bearings to disengage through an opening in the front face of the hammer, thus destroying the ball bearing system.
Summary of the Invention The present application discloses a structure for guiding a ball bearing deeper into a groove to avoid ball loss. The cam shaft of the present invention includes grooves that intersect at a vertex, and proximate the vertex, an asymmetric chamfer is disposed to direct the ball during deceleration forces, such as those caused by inadvertently dropping a tool. The chamfer guides the ball deeper into the groove such that the ball is spaced from the opening in the front face of the hammer. The ball is therefore less likely to disengage through the front opening of the hammer when the impact wrench is dropped.
For example, the present application discloses a cam shaft adapted for use in a tool, the cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including a plurality of groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within the cam shaft groove and adapted to deflect the ball away from the vertex and toward the base when a force in the axial direction is applied to the cam shaft.
Also disclosed is an assembly including a cam shaft adapted for use in a tool, the cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including two groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within
Technical Field of the Invention The present application relates to ball bearing systems. More particularly, the present application relates to a ball deflecting chamfer that deflects a ball bearing into an advantageous position when a force is applied to the ball bearing, thus preventing inadvertent removal of the ball from the system.
Background of the Invention Many tools have parts that interact with each other through ball bearings. The ball is typically positioned within a groove or circular cavity and provides a rolling interface between two moving parts, reducing friction between the parts while still allowing relative movement.
For example, impact wrenches include a ball bearing interface between a cam shaft and hammer. The ball is inserted into straight or angled grooves that are defined along the exterior of the cam shaft, and interface with cooperative grooves in thc hammer. One such cam shaft is shown in Fig. 5. This cam shaft 535 includes a base 540 and a shaft 545 extending from the base 540. The shaft 545 includes grooves 550 for receiving a ball bearing that interfaces with grooves in a hammer. The cam shaft 535 also includes holes 555 to receive fasteners, such as screws or nails, for attachment to other objects.
Prior art cam shafts 535 include grooves that include a vertex 560. When the impact wrench is dropped, the cam shaft 535 abruptly stops once it impacts the ground, and the deceleration forces move the balls to the vertex 560 of the cam shaft 535. At the same time, the hammer is movably disposed on the shaft 545 and moves axially against a spring, sliding over the ball bearings and allowing the ball bearings to disengage through an opening in the front face of the hammer, thus destroying the ball bearing system.
Summary of the Invention The present application discloses a structure for guiding a ball bearing deeper into a groove to avoid ball loss. The cam shaft of the present invention includes grooves that intersect at a vertex, and proximate the vertex, an asymmetric chamfer is disposed to direct the ball during deceleration forces, such as those caused by inadvertently dropping a tool. The chamfer guides the ball deeper into the groove such that the ball is spaced from the opening in the front face of the hammer. The ball is therefore less likely to disengage through the front opening of the hammer when the impact wrench is dropped.
For example, the present application discloses a cam shaft adapted for use in a tool, the cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including a plurality of groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within the cam shaft groove and adapted to deflect the ball away from the vertex and toward the base when a force in the axial direction is applied to the cam shaft.
Also disclosed is an assembly including a cam shaft adapted for use in a tool, the cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including two groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within
2 the cam shaft groove and adapted to deflect the ball away from the vertex and toward the base when a force in an axial direction is applied to the cam shaft, a hammer having an opening defined therein adapted to receive the ball bearings, the opening extending through the hammer to a front face of the hammer, and a bias member disposed between the cam shaft and the hammer.
Further disclosed is a tool including a power source adapted to supply power to the tool, a trigger adapted to selectively distribute the power from the power source, an impact end adapted to receive the power and apply an impact force and/or torque to a work piece, a cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including two groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within the cam shaft groove and adapted to deflect the ball away from the vertex and toward the base when a force in the axial direction is applied to the cam shaft, a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer and to a front face of the hammer, and a bias member disposed between the cam shaft and the hammer.
Brief Description of the Drawings For the purpose of facilitating an understanding of the subject matter sought to be protected, there are illustrated in the accompanying drawings embodiments thereof, from an inspection of which, when considered in connection with the following description, the subject matter sought to be protected, its construction and operation, and many of its advantages should be readily understood and appreciated.
Fig. 1 is a front perspective view of an exemplar tool incorporating an embodiment of the present application.
Further disclosed is a tool including a power source adapted to supply power to the tool, a trigger adapted to selectively distribute the power from the power source, an impact end adapted to receive the power and apply an impact force and/or torque to a work piece, a cam shaft including a base, a shaft extending from the base in an axial direction, a cam shaft groove disposed circumferentially around the shaft and adapted to movably retain a ball bearing, the cam shaft groove including two groove portions extending at an angle relative to the axial direction and intersecting at a vertex, and a chamfer defined within the cam shaft groove and adapted to deflect the ball away from the vertex and toward the base when a force in the axial direction is applied to the cam shaft, a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer and to a front face of the hammer, and a bias member disposed between the cam shaft and the hammer.
Brief Description of the Drawings For the purpose of facilitating an understanding of the subject matter sought to be protected, there are illustrated in the accompanying drawings embodiments thereof, from an inspection of which, when considered in connection with the following description, the subject matter sought to be protected, its construction and operation, and many of its advantages should be readily understood and appreciated.
Fig. 1 is a front perspective view of an exemplar tool incorporating an embodiment of the present application.
3 Fig. 2 is an exploded perspective view of an exemplar tool in accordance with an embodiment of the present application.
Fig. 3 is a side cross-sectional view of an assembly in accordance with an embodiment of the present application.
Fig. 4 is a side view of a cam shaft having an asymmetric chamfer in accordance with an embodiment of the present application.
Fig. 5 is a prior art cam shaft adapted for use in impact wrenches.
It should be understood that the comments included in the notes as well as the materials, dimensions and tolerances discussed therein are simply proposals such that one skilled in the art would be able to modify the proposals within the scope of the present application.
Detailed Description of the Embodiments While this invention is susceptible of embodiments in many different forms, there is shown in the drawings, and will herein be described in detail, a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to embodiments illustrated.
The present application discloses a cam shaft having an asymmetric chamfer for guiding a ball bearing deeper into a cam shaft groove when a deceleration force is applied to avoid ball loss. The chamfer deflects the ball deeper into the groove and away from a front opening in the hammer during axial movement of the hammer. The ball is therefore less likely to escape through the front opening of the hammer when the tool, such as an impact wrench, is inadvertently dropped.
Fig. 1 discloses an exemplar tool 100 according to the present application. As shown, the tool 100 is an impact wrench. It is to be understood, however, that the
Fig. 3 is a side cross-sectional view of an assembly in accordance with an embodiment of the present application.
Fig. 4 is a side view of a cam shaft having an asymmetric chamfer in accordance with an embodiment of the present application.
Fig. 5 is a prior art cam shaft adapted for use in impact wrenches.
It should be understood that the comments included in the notes as well as the materials, dimensions and tolerances discussed therein are simply proposals such that one skilled in the art would be able to modify the proposals within the scope of the present application.
Detailed Description of the Embodiments While this invention is susceptible of embodiments in many different forms, there is shown in the drawings, and will herein be described in detail, a preferred embodiment of the invention with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the broad aspect of the invention to embodiments illustrated.
The present application discloses a cam shaft having an asymmetric chamfer for guiding a ball bearing deeper into a cam shaft groove when a deceleration force is applied to avoid ball loss. The chamfer deflects the ball deeper into the groove and away from a front opening in the hammer during axial movement of the hammer. The ball is therefore less likely to escape through the front opening of the hammer when the tool, such as an impact wrench, is inadvertently dropped.
Fig. 1 discloses an exemplar tool 100 according to the present application. As shown, the tool 100 is an impact wrench. It is to be understood, however, that the
4 present invention can be used with other tools or devices without departing from the scope and spirit of the present invention. In an embodiment, the tool 100 includes an impact end 105 operably coupled to a power source 110, such as, for example, a battery, fuel cell, or pneumatic source. The power source 110 supplies power to the impact end 105 when a user pulls a trigger 115. A reversing lever 120 can be disposed on the tool 100 to reverse the drive direction of the impact end 105, and a vent 125 can be defined within the housing of the tool 100 to allow excess heat to escape from the tool 100. The tool 100 can also include a grip 130 for the user to grasp 100 during use.
The power source 110 can be any source of electrical or pneumatic power that can power the tool 100. In an embodiment, the power source 110 is a battery.
However, the power source 110 can be any component that provides power, including a battery, fuel cell, engine, solar power system, wind power system, hydroelectric power system, a power cord for attachment to an electrical socket, or any other means of providing power.
Fig. 2 illustrates an exploded view of an assembly 132 and Fig. 3 illustrates a side cross-sectional view of the assembly 132 in accordance with an embodiment of the present application. As shown, the assembly 132 includes a cam shaft 135 having a base 140 and a shaft 145 extending from the base 140 in an axial direction. The shaft 145 can include camshaft grooves 150 extending circumferentially around the shaft 145 and adapted to hold ball bearings. The base 155 can include holes defined therein for receiving fasteners and assembling the cam shaft 135 to other components of the tool 100.
The cam shaft 145 can abut a bias member 160 that is aligned with a washer 165 and bearing 170, as shown. One or more balls 175 can be disposed within the cam shaft grooves 150 and interface the cam shaft 145 with a hammer 180. The hammer 180 can
The power source 110 can be any source of electrical or pneumatic power that can power the tool 100. In an embodiment, the power source 110 is a battery.
However, the power source 110 can be any component that provides power, including a battery, fuel cell, engine, solar power system, wind power system, hydroelectric power system, a power cord for attachment to an electrical socket, or any other means of providing power.
Fig. 2 illustrates an exploded view of an assembly 132 and Fig. 3 illustrates a side cross-sectional view of the assembly 132 in accordance with an embodiment of the present application. As shown, the assembly 132 includes a cam shaft 135 having a base 140 and a shaft 145 extending from the base 140 in an axial direction. The shaft 145 can include camshaft grooves 150 extending circumferentially around the shaft 145 and adapted to hold ball bearings. The base 155 can include holes defined therein for receiving fasteners and assembling the cam shaft 135 to other components of the tool 100.
The cam shaft 145 can abut a bias member 160 that is aligned with a washer 165 and bearing 170, as shown. One or more balls 175 can be disposed within the cam shaft grooves 150 and interface the cam shaft 145 with a hammer 180. The hammer 180 can
5 , include hammer lugs 185 for receiving radial impact, and hammer grooves 190 for receiving the ball 175. Alternately, the hammer 180 can include an opening at the front face 180a thereof, that is not divided into separate grooves. The hammer grooves 190 can also extend partially through the hammer 180 and not to the front face 180a.
An anvil 195 can be axially disposed relative to the hammer 180 and can apply the impact to the hammer 180 via the anvil lugs 200. During operation, the hammer 180 can receive power from the power source 110 and rotate discontinuously, i.e., with sporadic impact rather than a continuous rotational speed or torque. The hammer 180 can then impact the anvil 195 when the hammer lugs 185 strike anvil lugs 200, causing the anvil 195 to rotate and act upon the work piece with the impact end 105.
The hammer 180 will also move axially based on the power supplied by the battery 110 and the impact provided to the anvil 195, thereby compressing the bias member 160 and moving axially along the shaft 145 of the cam shaft 135.
When the tool 100 is dropped, thereby causing an immediate deceleration force to the tool 100, the ball 175 can shift to a point in the cam shaft grooves 150 closest the front face 180a of the hammer 180, and the cam shaft 135 remains stationary.
At the same time, the hammer 180 moves axially along the shaft 145 and applies more force to the bias member 160 than during normal operation due to the tool 100 being dropped.
This increased force compresses the bias member 160 more so than during normal operation and places the hammer 180 deeper on the shaft 145, i.e., closer to the base 140.
In doing so with a prior art system, the front face of the hammer would be located at a point closer to the base of the cam shaft than the ball positioned within the cam shaft grooves, thereby putting the ball in danger of escaping through the cam shaft grooves at the front face of the hammer. However, as discussed below, the improvements disclosed
An anvil 195 can be axially disposed relative to the hammer 180 and can apply the impact to the hammer 180 via the anvil lugs 200. During operation, the hammer 180 can receive power from the power source 110 and rotate discontinuously, i.e., with sporadic impact rather than a continuous rotational speed or torque. The hammer 180 can then impact the anvil 195 when the hammer lugs 185 strike anvil lugs 200, causing the anvil 195 to rotate and act upon the work piece with the impact end 105.
The hammer 180 will also move axially based on the power supplied by the battery 110 and the impact provided to the anvil 195, thereby compressing the bias member 160 and moving axially along the shaft 145 of the cam shaft 135.
When the tool 100 is dropped, thereby causing an immediate deceleration force to the tool 100, the ball 175 can shift to a point in the cam shaft grooves 150 closest the front face 180a of the hammer 180, and the cam shaft 135 remains stationary.
At the same time, the hammer 180 moves axially along the shaft 145 and applies more force to the bias member 160 than during normal operation due to the tool 100 being dropped.
This increased force compresses the bias member 160 more so than during normal operation and places the hammer 180 deeper on the shaft 145, i.e., closer to the base 140.
In doing so with a prior art system, the front face of the hammer would be located at a point closer to the base of the cam shaft than the ball positioned within the cam shaft grooves, thereby putting the ball in danger of escaping through the cam shaft grooves at the front face of the hammer. However, as discussed below, the improvements disclosed
6 in the present application provide a chamfer on the cam shaft to direct the ball into a position in which they are less likely to escape.
As shown in Fig. 4, and as distinguished from Fig. 5, the cam shaft 135 can include a chamfer 205 proximate a vertex 210 to deflect the balls 175 deeper into the cam shaft grooves 150 as compared to the prior art example shown in Fig. 5. As shown, the cam shaft grooves 150 can include two groove portions that are angled relative to the axial direction of the cam shaft 135 and that intersect at the vertex 210.
During operation, if the tool 100 is dropped, the ball 175 deflects deeper into the angled cam shaft grooves 150 and away from the front face 180a of the hammer 180. The ball 175 is thus less likely to escape from the front face 180a of the hammer 180 when the tool is dropped.
The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. While particular embodiments have been shown and described, it will be apparent to those skilled in the art that changes and modifications may be made without departing from the broader aspects of applicants' contribution. The actual scope of the protection sought is intended to be defined in the following claims when viewed in their proper perspective based on the prior art.
As shown in Fig. 4, and as distinguished from Fig. 5, the cam shaft 135 can include a chamfer 205 proximate a vertex 210 to deflect the balls 175 deeper into the cam shaft grooves 150 as compared to the prior art example shown in Fig. 5. As shown, the cam shaft grooves 150 can include two groove portions that are angled relative to the axial direction of the cam shaft 135 and that intersect at the vertex 210.
During operation, if the tool 100 is dropped, the ball 175 deflects deeper into the angled cam shaft grooves 150 and away from the front face 180a of the hammer 180. The ball 175 is thus less likely to escape from the front face 180a of the hammer 180 when the tool is dropped.
The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. While particular embodiments have been shown and described, it will be apparent to those skilled in the art that changes and modifications may be made without departing from the broader aspects of applicants' contribution. The actual scope of the protection sought is intended to be defined in the following claims when viewed in their proper perspective based on the prior art.
7
Claims (20)
1. A cam shaft adapted for use in a tool, the cam shaft comprising:
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove includes groove portions respectively extending at angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in the axial direction is applied to the cam shaft.
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove includes groove portions respectively extending at angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in the axial direction is applied to the cam shaft.
2. The cam shaft of claim 1, further comprising holes disposed in the base and adapted to respectively receive fasteners.
3. The cam shaft of claim 1, wherein the chamfer is defined within only one of the groove portions.
4. A tool comprising:
a cam shaft including:
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove including groove portions respectively extending at angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in an axial direction is applied to the cam shaft;
a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer to a front face of the hammer; and a bias member disposed between the cam shaft and the hammer.
a cam shaft including:
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove including groove portions respectively extending at angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in an axial direction is applied to the cam shaft;
a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer to a front face of the hammer; and a bias member disposed between the cam shaft and the hammer.
5. The tool of claim 4, further comprising a washer disposed between the bias member and the hammer.
6. The tool of claim 5, further comprising a bearing disposed between the washer and the hammer.
7. The tool of claim 4, further comprising an anvil, wherein the hammer is adapted to rotate and impact the anvil.
8. The tool of claim 7, wherein the hammer includes hammer lugs, the anvil includes anvil lugs, and the hammer lugs are adapted to rotate and respectively impact the anvil lugs.
9. The tool of claim 8, wherein the anvil includes an impact end adapted to apply torque and/or impact to a work piece.
10. The tool of claim 4, further comprising holes disposed in the base and adapted to respectively receive fasteners.
11. The tool of claim 4, wherein the chamfer is defined within only one of the groove portions.
12. The tool of claim 4, wherein the opening includes hammer grooves.
13. A tool comprising:
a power source adapted to supply power to the tool;
a trigger adapted to selectively cause power to be distributed from the power source;
an impact end adapted to apply an impact force and/or torque to a work piece;
a cam shaft including:
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove including two groove portions extending at respective angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in the axial direction is applied to the cam shaft;
a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer and to a front face of the hammer; and a bias member disposed between the cam shaft and the hammer.
a power source adapted to supply power to the tool;
a trigger adapted to selectively cause power to be distributed from the power source;
an impact end adapted to apply an impact force and/or torque to a work piece;
a cam shaft including:
a base;
a shaft extending from the base in an axial direction;
a cam shaft groove circumferentially disposed around the shaft and adapted to retain a ball, the cam shaft groove including two groove portions extending at respective angles relative to the axial direction and intersecting at a vertex; and a chamfer defined within the cam shaft groove proximate the vertex and adapted to deflect the ball away from the vertex when a force in the axial direction is applied to the cam shaft;
a hammer having an opening defined therein adapted to receive the ball, the opening extending through the hammer and to a front face of the hammer; and a bias member disposed between the cam shaft and the hammer.
14. The tool of claim 13, further comprising a washer disposed between the bias member and the hammer.
15. The tool of claim 14, further comprising a bearing disposed between the washer and the hammer.
16. The tool of claim 13, further comprising an anvil, wherein the hammer is adapted to rotate and impact the anvil.
17. The tool of claim 15, wherein the hammer includes hammer lugs, the anvil includes anvil lugs, and the hammer lugs are adapted to rotate and respectively impact the anvil lugs.
18. The tool of claim 13, further comprising holes disposed in the base and adapted to respectively receive fasteners.
19. The tool of claim 13, wherein the chamfer is defined within only one of the groove portions.
20. The tool of claim 13, wherein the opening includes hammer grooves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/894,075 | 2013-05-14 | ||
| US13/894,075 US9505107B2 (en) | 2013-05-14 | 2013-05-14 | Ball deflecting chamfer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2849803A1 CA2849803A1 (en) | 2014-11-14 |
| CA2849803C true CA2849803C (en) | 2017-08-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2849803A Active CA2849803C (en) | 2013-05-14 | 2014-04-25 | Ball deflecting chamfer |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US9505107B2 (en) |
| CN (1) | CN104154208B (en) |
| AU (1) | AU2014202296B2 (en) |
| CA (1) | CA2849803C (en) |
| GB (1) | GB2516530B (en) |
| HK (1) | HK1199296A1 (en) |
| TW (1) | TWI572453B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011089910A1 (en) * | 2011-12-27 | 2013-06-27 | Robert Bosch Gmbh | Hand tool device |
| DE102015201573A1 (en) * | 2015-01-29 | 2016-08-04 | Robert Bosch Gmbh | Impact device, in particular for an impact wrench |
| DE102015204807A1 (en) * | 2015-03-17 | 2016-09-22 | Robert Bosch Gmbh | Hand tool and mechanical percussion |
| JP6638522B2 (en) * | 2015-08-07 | 2020-01-29 | 工機ホールディングス株式会社 | Electric tool |
| JP6832509B2 (en) * | 2017-03-27 | 2021-02-24 | パナソニックＩｐマネジメント株式会社 | Rotary striking tool |
| TWI658907B (en) * | 2018-05-25 | 2019-05-11 | 朝程工業股份有限公司 | Double hammer impact wrench |
| US11389933B2 (en) * | 2019-09-30 | 2022-07-19 | Ingersoll-Rand Industrial U.S., Inc. | Anti-topping impact tool mechanism |
| US12048988B2 (en) * | 2020-12-08 | 2024-07-30 | Snap-On Incorporated | Impact mechanism for a rotary impact tool |
| KR102343886B1 (en) * | 2021-02-09 | 2021-12-27 | 아이메디컴(주) | Impacting device for orthopedics |
| JP2023181599A (en) * | 2022-06-13 | 2023-12-25 | 株式会社マキタ | Impact tool |
| JP2024029608A (en) * | 2022-08-22 | 2024-03-06 | 株式会社マキタ | Impact tool |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2745528A (en) * | 1953-01-05 | 1956-05-15 | Chicago Pneumatic Tool Co | Reversible impact wrench |
| US2712254A (en) * | 1953-05-14 | 1955-07-05 | Schodeberg Carl Theodore | Power driven impact tool |
| JPH02232176A (en) * | 1989-03-02 | 1990-09-14 | Kazunori Ikegami | Automatic impact type driver |
| US5573074A (en) * | 1995-02-13 | 1996-11-12 | Gpx Corp. | Gear shifting power tool |
| US5836403A (en) * | 1996-10-31 | 1998-11-17 | Snap-On Technologies, Inc. | Reversible high impact mechanism |
| US5992538A (en) * | 1997-08-08 | 1999-11-30 | Power Tool Holders Incorporated | Impact tool driver |
| AU7167598A (en) | 1997-08-08 | 1999-03-01 | Power Tool Holders Incorporated | Impact tool driver |
| US6158526A (en) * | 1999-03-09 | 2000-12-12 | Snap-On Tools Company | Reversible impact mechanism with structure limiting hammer travel |
| JP2002254336A (en) * | 2001-03-02 | 2002-09-10 | Hitachi Koki Co Ltd | Power tool |
| US20070089891A1 (en) | 2005-10-26 | 2007-04-26 | Hsin-Chi Chen | Anti-disengagement structure for guide balls of a striking unit |
| DE202005017305U1 (en) | 2005-11-05 | 2006-02-16 | TRANMAX MACHINERY Co., Ltd., Taiping | Fall preventing device for guide bearings used in electric power tool with impact unit, has stopper portions arranged at surface of seat section to block and prevent guide bearings from jumping out from open end of spherical recesses |
| US7673702B2 (en) | 2007-08-09 | 2010-03-09 | Ingersoll-Rand Company | Impact wrench |
| JP2009226568A (en) * | 2008-03-25 | 2009-10-08 | Makita Corp | Impact tool |
| JP5728303B2 (en) * | 2011-06-15 | 2015-06-03 | 株式会社マキタ | Impact tool |
-
2013
- 2013-05-14 US US13/894,075 patent/US9505107B2/en active Active
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2014
- 2014-04-25 CA CA2849803A patent/CA2849803C/en active Active
- 2014-04-29 AU AU2014202296A patent/AU2014202296B2/en active Active
- 2014-05-01 GB GB1407727.5A patent/GB2516530B/en active Active
- 2014-05-07 TW TW103116301A patent/TWI572453B/en active
- 2014-05-13 CN CN201410201865.4A patent/CN104154208B/en active Active
- 2014-12-19 HK HK14112751.8A patent/HK1199296A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US9505107B2 (en) | 2016-11-29 |
| TW201505779A (en) | 2015-02-16 |
| CN104154208A (en) | 2014-11-19 |
| AU2014202296B2 (en) | 2016-01-21 |
| HK1199296A1 (en) | 2015-06-26 |
| GB2516530B (en) | 2015-10-07 |
| AU2014202296A1 (en) | 2014-12-04 |
| CA2849803A1 (en) | 2014-11-14 |
| GB201407727D0 (en) | 2014-06-18 |
| GB2516530A (en) | 2015-01-28 |
| CN104154208B (en) | 2017-05-17 |
| TWI572453B (en) | 2017-03-01 |
| US20140338942A1 (en) | 2014-11-20 |
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